Radio base station and control method thereof

ABSTRACT

To provide a radio base station and a control method thereof wherein a simple way is used to relax the load concentration of a power control and also relax the control delay. A radio base station and a control method thereof wherein a frame generating part inserts a dummy TPC command, and a power setting part sets a TPC command, whereby a process of deciding the TPC command to be inserted can be delayed by the time required for the processes done in the frame generating part, a modulating part and a spreading part and wherein the process of deciding the TPC command and a process of deciding a power value are separated from and done at different timings from a process of controlling a TPC command insertion status and a process of controlling a power setting status, with the result that even when the processes are concentrated, a load dispersion can be done.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a radio base station for performingradio communication with a mobile terminal, and particularly to a radiobase station for performing so-called transmission power control ofinserting a power control (TPC: Transmitter Power Control) command intotransmission data so that reception quality of signals from a mobileterminal is constant, and also adjusting transmission power by a TPCcommand from the mobile terminal, and a control method thereof.

2. Description of the Related Art

The construction of a radio base station for performing transmissionpower control using a prior art will be described with reference to FIG.8 by exemplifying a W-CDMA (Wide Band—Code Division Multiple Access)system. FIG. 8 is a block diagram showing the construction of aconventional radio base station.

As shown in FIG. 8, the conventional radio base station is equipped withbase band transmitting/receiving parts 11, 12, 13, . . . for performingbase band transmission/reception of each call under the control of abase station, and a channel (CH) multiplexing part 21 for multiplexingchannels and outputting a base band (BB) transmission signal.

The base band transmitting/receiving part 11 takes charge of a channelzero (#CH0), the base band transmitting/receiving part 12 takes chargeof a channel 1 (#CH1), and the base band transmitting/receiving part 13takes charge of a channel 2 (#CH2).

Each base band transmitting part comprises an encoding part 101 forencoding transmission data, a frame generating part 102 for inserting apilot symbol for synchronous detection and a TPC command into theencoded transmission data, a modulating part 103 for performing primarymodulation such as QPSK (Quadrature Phase Shift Keying), 16 QAM(16-positions Quadrature Amplitude Modulation) or the like, a spreadingpart 104 for performing spreading modulation by using a spreading codeof each call, a power control part 105 for determining a power value ofeach call, a power setting part 106 for multiplying the spread signal ofeach call by the power value determined in the power control part 105,de-spreading parts 107-1, 107-2 for performing de-spreading from areception signal by using a reference code of each call and extractingthe reception signal of the call, detecting parts 108-1, 108-2 forsubjecting the extracted reception signal of each call to synchronousdetection, an SIR measuring part 109 for measuring reception quality(SIR: Signal to Interference Ration: the ratio of desired wave power tointerfering wave power) of the extracted reception signal of each call,an insertion TPC generating part 110 for determining an insertion TPCcommand from the measured SIR, a TPC judging part 111 for judging theTPC command out of the synchronously-detected reception signal, a datajudging part 112 for judging transmission data out of thesynchronously-detected reception signal, and a decoding part 113 fordecoding the judged transmission data.

Furthermore, the CH multiplexing part 21 is a site for adding andmultiplexing transmission-processed data of each call.

The operation of the conventional radio base station shown in FIG. 8,particularly, the operation associated with the transmission powercontrol will be described.

First, the transmission data encoded in the encoding part 101 is inputto the frame generating part 102. In the frame generating part 102, thesynchronous detection pilot system and the TPC command are inserted intothe transmission data.

As shown in FIG. 9, the pilot symbol and the TPC command are inserted ata period of one slot (slot) of the transmission signal. FIG. 9 is adiagram showing an example of the frame construction of a downlink(Downlink: DL) and an uplink (Uplink: UL). In FIG. 9, p represents apilot symbol, d represents a data symbol and t represents a TPC command.

With respect to the pilot symbol, a unique symbol for which a slotnumber allocated on the basis of the system timing of the call concernedhas been already known at both the base station and the terminal isinserted.

With respect to the TPC command, for example, SIR is measured from thereceived pilot symbol of a call A (UL) of FIG. 9, and the insertion TPCcommand is determined and generated in accordance with the measurementresult in the insertion TPC generating part 110. In general, a referenceSIR and the measured SIR of the call concerned are compared with eachother, and the following commands are generated:

in case of measured SIR>reference SIR, DOWN command, or

in case of measured SIR<reference SIR, UP command.

The generated insertion TPC command is inserted into the next one slotof the transmission signal of the call A (DL) in the frame generatingpart 102, and the framed transmission data are modulated in themodulating part 103, spread in the spreading part 104, and input to thepower setting part 106.

The received BB signal is de-spread in the de-spreading parts 107-1,107-2 by the reference code of the call concerned, and subjected to thesynchronous detection in the detection parts 108-1, 108-2. With respectto the TPC command, the judgment of the TPC command symbol is made inthe TPC judging part 111, and with respect to the data symbol, thejudgment of data is made in the data judging part 112.

The data judged in the data judging part 112 are decoded in the decodingpart 113, whereby reception data can be obtained.

Furthermore, the TPC command judged in the TPC judging part 111generally has “power UP”, “power DOWN” information, and on the basis ofa judgment result in the TPC judging part 111, the power control part105 determines power of +1 dB for the present power value in case of“power UP” and −1 dB in case of “power DOWN”.

The determined power value is reflected at a timing as shown in FIG. 9,multiplied by the transmission data in the power setting part 106 andthen output. The transmission data which are bit-expanded by the powervalue of each call are multiplied in the CH multiplexing part 21 andoutput.

JP-A-2005-159495 “TRANSMISSION POWER CONTROL METHOD” (see PatentDocument 1) is known as a prior art concerning transmission powercontrol in DS-CDMA (Direct Sequence Code Division Multiple Access)assuming that so-called transmission power control of adjustingtransmission power from a counter station so that reception quality fromthe counter station is constant is carried out at sometransmission/reception station.

Patent Document 1: JP-A-2005-159496

The above operation is carried out for plural calls in the radio basestation. In this case, there is the following problem.

The problem will be described with reference to FIGS. 10 and 11. FIG. 10is a schematic diagram showing the frame construction when a frameboundary of each call has an offset to a system timing relatively, andFIG. 11 is a schematic diagram showing the frame construction when theframe boundary of each call is coincident with the system timing.

In the case shown in FIG. 10, the permissible power setting time and theinsertion TPC generating time of each call likewise has an offset to thesystem timing, and in other words, it equivalently means that theprocessing load of each call which is effective to the permissible timeis dispersed.

On the other hand, in the case of FIG. 11, the permissible power settingtime and the insertion TPC generating time of each call are completelycoincident, and thus this equivalently means that the effectiveprocessing time of each call to the permissible time is required to beshort, that is, the load is concentrated.

When the system permits this condition, high-speed processing must beexecuted so as to adapt to the load concentration. For example, when itis assumed that the above processing is executed by using a signalprocessing processor, it is considered that a high-speed processor whichcan also adapt to the load concentration is used.

However, there is a problem that a higher speed processor is moreexpensive.

Furthermore, as the processing construction of the above processing,when the processing is executed under the condition that the processingamount per unit time is determined, for example, there are two callsduring one symbol time, there occurs a problem that the permissible timecan be kept for some call, but the permissible time cannot be kept foranother call. When the permissible time cannot be kept, parasiticoscillation caused by so-called power control delay occurs, and thereception quality is deteriorated at both the base station side and theterminal side.

The insertion TPC processing of FIG. 8 is executed in the framegenerating part 102, and the modulation processing in the modulatingpart 103, the spreading processing in the spreading part 104 and thepower setting processing in the power setting part 106 are sequentiallyexecuted subsequently to the frame generating processing.

That is, with respect to the timing at which the TPC command isinserted, in consideration of the processing time of the modulation, thespreading, the power setting, etc., this processing is required to beexecuted much earlier. This effectively means that the permissibleinsertion TPC generating time of FIG. 9 is further shorter, and thus theabove problem when the load is concentrated is estimated to be moreserious.

SUMMARY OF THE INVENTION

The present invention has been implemented in view of the foregoingsituation, and has an object to provide a radio base station forrelaxing load concentration of power control by a simply method and alsorelaxing control delay, and a control method thereof.

In order to solve the problem of the above prior art, according to thepresent invention, a radio base station that inserts a power controlcommand into transmission data so that reception quality of signals froma mobile terminal is constant and adjusts transmission power on thebasis of the power control command in reception data from the mobileterminal comprises: a quality measuring part for measuring the qualityof a reception signal; a power control command insertion status controlpart for controlling a condition for determining a power control commandto be inserted into transmission data; a power control commanddetermining part for determining the power control command to beinserted on the basis of the measured quality of the reception signaland the condition for determining the power control command; adetecting/judging part for synchronously detecting and judging the powercontrol command from the reception data; a power setting statuscontroller for controlling a condition for determining transmissionpower for a call; a power determining part for determining atransmission power value for the call concerned on the basis of thejudged power control command and the condition for determining thetransmission power; a frame generating part for inserting a pilot symbolfor synchronous detection and a dummy power control command into encodedtransmission data to generate a frame; a modulating part for subjectingthe frame-generated transmission data to primary modulation; a spreadingpart for performing spreading modulation by using a spreading code ofeach call; and a power setting part for multiplying the transmissionpower value determined in the power determining part by a signal whichis subjected to spreading modulation every call. Therefore, theprocessing in the power control command determining part to whichreal-time performance is required can be delayed by the amountcorresponding to the processing time of the frame generating part, themodulating part and the spreading part by setting the power controlcommand in the power setting part, and even when the processing to whichreal-time performance is required is concentrated, the load can bedispersed.

Furthermore, according to the present invention, in the radio basestation, the power setting part has a function of inverting the sign ofthe transmission power value in accordance with the inserted powercontrol (TPC) command when the transmission data are the timing at thepower control (TPC) command to be timely inserted.

According to the present invention, in the radio base station, thedetermination of the power control command in the power control commanddetermining part and the determination of the transmission power valuein the power determining part are carried out at the timing of eachcall, and the control processing in the power control command insertionstatus control part and the control processing in the power settingstatus control part are executed on all calls under the control of thebase station collectively or while the number of calls to be processedper unit time is determined.

According to the present invention, a method of controlling a radio basestation that inserts a power control command into transmission data sothat reception quality of signals from a mobile terminal is constant,and adjusts transmission power on the basis of the power control commandin reception data from the mobile terminal comprises: inserting a fixedsymbol serving as a power control command as a dummy irrespective of thequality of a reception signal measured in a quality measuring part,generating timing information for identifying a symbol in which thepower control command as the dummy is inserted and outputting the timinginformation to the power setting part by a frame generating part;modulating framed transmission data by a modulating part; spreading thetransmission data in a spreading part; and setting the power controlcommand corresponding to the quality of the reception signal measured inthe quality measuring part on the basis of the timing information andsubjecting the spread transmission data to power setting by a powersetting part. Accordingly, the processing in the power control commanddetermining part to which real-time performance is required can bedelayed by the amount corresponding to the processing time of the framegenerating part, the modulating part and the spreading part by settingthe power control command in the power setting part, and even when theprocessing to which real-time performance is required is concentrated,the load can be dispersed.

According to the present invention, in the radio base station controlmethod, the power determining part determines a transmission powervalue, and the power setting part inverts the sign of the transmissionpower value in accordance with the power control command.

According to the present invention, in the radio base station controlmethod, the power control command determining part executes theprocessing of determining the power control command corresponding to thequality of the reception signal measured in the quality measuring partat the timing of each call, the power determining part executes theprocessing of determining the transmission power value at the timing ofeach call, the power control command insertion status control partexecutes the control processing on all the calls under the control ofthe base station collectively or while the number of calls to beprocessed per unit time is determined, and the power setting statuscontrol part executes the control processing on all the calls under thecontrol of the base station collectively or while the number of calls tobe processed per unit time is determined. Accordingly, the processing inthe power control command determining part and the processing in thepower determining part to which real-time performance is required, andthe control processing of the power control command insertion statuscontrol part and the control processing of the power setting statuscontrol part to which real-time performance is not required can beseparately executed at different timings, and the load concentration ofthe processing to which real-time performance is required can bereduced.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram showing the construction of a radio basestation according to an embodiment of the present invention.

FIG. 2 is a block diagram showing the construction of a power settingpart.

FIG. 3 is a diagram showing an example of TPC command symbol mapping inQPSK modulation.

FIG. 4 is a diagram showing a condition content for determiningtransmission power.

FIG. 5 is a diagram showing a processing example of a power settingstatus control part and a power determining part.

FIG. 6 is a diagram showing a condition content to determine insertionTPC.

FIG. 7 is a diagram showing a processing example of a TPC insertionstatus control part and an insertion TPC determining part.

FIG. 8 is a block diagram showing the construction of a conventionalradio base station.

FIG. 9 is a diagram showing a frame construction example of a downlink(DL) and an uplink (UL).

FIG. 10 is a schematic diagram showing the frame construction when aframe boundary of each call has an offset to a system timing relatively.

FIG. 11 is a schematic diagram showing the frame construction when theframe boundary of each call is coincident with the system timing.

DESCRIPTION OF REFERENCE NUMERALS

11, 12, 13, 51, 53 . . . base band transmitting/receiving part, 101, 501. . . encoding part, 102, 502 . . . frame generating part, 103, 503 . .. modulating part, 104, 504 . . . spreading part, 105 . . . powercontrol part, 106 . . . power setting part, 107-1, 107-2 . . .de-spreading part, 507-1, 507-2, de-spreading part, 108-1, 108-2 . . .detecting part, 508-1, 508-2 . . . detecting part, 109, 509 . . . SIRmeasuring part, 110 . . . insertion TPC generating part, 510 . . .insertion TPC determining part, 111, 511 . . . TPC judging part, 112,512 . . . data judging part, 113, 513 . . . decoding part, 21, 61 . . .CH multiplexing part, 71 . . . power setting status control part, 81 . .. TPC insertion status control part

DESCRIPTION OF THE PREFERRED EMBODIMENT

An embodiment according to the present invention will be described withreference to the drawings.

In a radio base station and a control method of the radio base stationaccording to this embodiment of the present invention, a TPC command asa dummy is inserted in a frame generating part, and setting of the TPCcommand is carried out in a power setting part. Therefore, theprocessing of determining a TPC command to be inserted can be delayed bythe amount corresponding to the processing time of the frame generatingpart, a modulating part and the spreading part, and thus even when theprocessing is concentrated, the load can be dispersed.

Furthermore, in the radio base station of this embodiment of the presentinvention, the processing of determining the TPC command and theprocessing of determining the power value to which real-time performanceis required, and the control processing of the TPC command insertionstatus and the power setting status control processing to which noreal-time performance is required are executed separately from eachother at different timings, so that the concentration of the loadimposed on the processing to which the real-time performance is requiredcan be reduced.

The construction of the radio base station according to the embodimentof the present invention will be described with reference to FIG. 1.FIG. 1 is a block diagram showing the construction of the radio basestation according to the embodiment of the present invention.

As shown in FIG. 1, the radio base station (this base station) of theembodiment of the present invention has base band transmitting/receivingparts 51, 52, 53, . . . for performing base band transmission/receptionof each call under the control of the base station, a channel (CH)multiplexing part 61 for multiplexing channels and outputting a baseband (BB) transmission signal, a power setting status control part 71for controlling a condition for determining transmission power, and aTPC insertion status control part 81 for controlling a condition fordetermining an insertion TPC command.

The base band transmission/reception part 51 takes charge of a channelzero (#CH0), the base band transmitting/receiving part 52 takes chargeof a channel 1 (#CH1) and the base band transmitting/receiving part 53takes charge of a channel 2 (#CH2).

Each base band transmitting/receiving part comprises an encoding part501 for encoding transmission data, a frame generating part 502 forinserting a pilot symbol for synchronous detection and a TPC command asa dummy into the encoded transmission data, a modulating part 503 forperforming primary modulation such as QPSK, 16 QAM or the like, aspreading part 504 for performing spreading modulation by using aspreading code of each call, a power determining part 505 fordetermining a power value of each call and outputting the power value, apower setting part 506 for multiplying the spreading signal of each callby the power value determined in the power determining part 505,de-spreading parts 507-1, 507-2 for performing de-spreading from thereception signal by using a reference code of each call to extract thereception signal of the call, detecting parts 508-1, 508-2 forsubjecting the extracted reception signal of each call to synchronousdetection, an SIR measuring part 509 for measuring reception quality(SIR) of the extracted reception signal of each call, an insertion TPCgenerating part 510 for determining an insertion TPC command from themeasured SIR, a TPC judging part 511 for making a judgment concerningthe TPC command out of the synchronously detected reception signal, adata judging part 512 for making a judgment concerning transmission dataout of the synchronously detected reception signal, and a decoding part513 for decoding the judged transmission data.

The CH multiplexing part 61 is a site for adding and multiplexing dataof each call which has been subjected to the transmission processing.The power setting status control part 71 is a site for controlling acondition for determining transmission power for a call under thecontrol of the radio base station.

The TPC insertion status control part 81 is a site for controlling acondition for determining a TPC command to be inserted for a call underthe control of the radio base station.

Next, the operation in the base station will be described with referenceto FIG. 1.

The transmission data encoded in the encoding part 501 are input to theframe generating part 502.

In the frame generating part 502, a pilot symbol for synchronousdetection and a dummy TPC command are inserted into the transmissiondata. The pilot symbol and the TPC command are inserted at one slotperiod of transmission signal as in the case of the prior art. A uniquesymbol for which a slot number allocated on the basis of the systemtiming of the call concerned has been already known in both the basestation and the terminal is inserted as the pilot symbol.

In the embodiment of this invention, with respect to the TPC commandinserted in the frame generating part 502, a fixed symbol is inserted asa dummy irrespective of the measured SIR. Furthermore, the framegenerating part 502 generates insertion TPC timing information so that adummy TPC-command inserted symbol can be identified, and outputs theinsertion TPC timing information to the power setting part 506. Theframed transmission data are modulated in the modulating part 503,subjected to spreading in the spreading part 504 and then input to thepower setting part 506.

In the power setting part 506, the setting of power and the insertion ofthe TPC command are performed.

Here, the method of inserting the TPC command in the power setting part506 will be described with reference to FIG. 2. FIG. 2 is a blockdiagram showing the construction of the poser setting part.

In FIG. 2, an insertion TPC judging part 601 judges whether the TPCinformation to be inserted (insertion TPC information) which correspondsto an output from the insertion TPC determining part 510 is “power UPinstruction” or “power DOWN instruction”.

A switch part 602 performs a switching operation between the output “−1”if the judged insertion TPC information indicates “power DOWNinstruction” and the output “+1” if the judged insertion TPC informationindicates “power UP instruction”.

A multiplier 603 multiplies the power setting value corresponding to theoutput of the power determining part 505 by the output of the switchpart 602 to allocate a sign to the power setting value.

The multiplying part 604 multiplies the “+” or “−” sign allocated powersetting value by the spread signal from the spreading part 504, andoutputs the spread signal after the power setting.

As described above, the TPC command symbol inserted in the framegenerating part 502 is a dummy, and it is a fixed symbol. If QPSK isassumed as primary modulation and an example as shown in FIG. 3 isassumed, the TPC symbol may take any one of (1) and (2). FIG. 3 is adiagram showing an example of the TPC command symbol mapping in QPSKmodulation.

The insertion TPC timing information is input from the frame generatingpart 502, the switch 602 is operated on the basis of the insertion TPCcommand judgment result when the TPC insertion timing comes, the sign isallocated to the power setting value in the multiplier 603, +(powersetting value) or −(power setting value) is output.

If the TPC command to be inserted as a dummy is assumed to be an UPcommand ((1) of FIG. 3), the insertion TPC command is inverted by themultiplication of the multiplier 604 to be a phase point of (2) of FIG.3 when the value of the output of the multiplier 603 is equal to −(powersetting value).

Conversely, when the value of the output of the multiplier 603 is equalto +(power setting value), the insertion TPC command is kept to thephase point of (1) of FIG. 3 even after the multiplication of themultiplier 604.

In the base station, the insertion TPC timing can be delayed moreeffectively than the prior art.

The received BB signal is de-spread by using the reference code for thecal concerned in the de-spreading parts 507-1, 507-2, and subjected tosynchronous detection in the synchronous detection parts 508-1, 508-2.The TPC command symbol is judged in the TPC judging part 511, and thedata symbol is judged in the data judging part 512. The data judged inthe data judging part 512 is decoded in the decoding part 513 to obtainthe reception data.

Here, transmission power control mans in the base station will bedescribed with reference to FIGS. 4 to 7.

FIG. 4 is a diagram showing a condition content for determiningtransmission power, FIG. 5 is a diagram showing processing examples ofthe power setting status control part and the power determining part,FIG. 6 is a diagram showing a condition content for determining theinsertion TPC, and FIG. 7 is a diagram showing processing examples ofthe TPC insertion status control part and the insertion TPC determiningpart.

As the condition for determining the transmission power shown in FIG. 4,the power setting status control part 71 “judges” the “condition” to an“input”, and when the “judgment” result is output to the powerdetermining part 505, it controls to establish the “state” based on the“judgment” result.

That is, when the information indicated in an “input” column or the likeis input to the power setting status control part 71, a judgmentconcerning the condition corresponding to the information as shown in a“condition, judgment” column, and the state is controlled in the powerdetermining part 505 on the basis of the judgment result to thecondition as shown in a “status” column.

The power setting status control part 71 judges the priority of eachstate or whether the state is achievable or unachievable on the system,selects any one of the statuses of enforced power increase control,power value hold (keep) control, +1 dB control based on the judgmentTPC, ±2 dB control based on the judgment TPC, transmission OFF andoutputs it as a power setting status as shown in FIG. 5.

The operation is carried out on the basis of the power setting status inthe power determining part 505.

For example, when the ±1 dB control status based on the judgment TPC isindicated, the calculation and determining processing of the powersetting value in the call concerned is carried out at the timing of thecall concerned by using the judgment TPC and the reference power valueto determine and renew the present power setting value.

As described with respect to the above example, the processing (control)concerning the determination of the power value is separated into theprocessing in the power determining part 505, etc. to which real-timeperformance is truly required as a portion at which the processing isnot executed unless the result of the judgment TPC has been known, andthe processing in the power setting status control part 71 as a portionto which real-time performance is not required because it has been knownin advance.

As the condition for determining the insertion TPC shown in FIG. 6, theTPC insertion status control part 81 “judges” a “condition” to an“input” in, and when the “judgment” result is output to the insertionTPC determining part 510, it controls the insertion TPC determining part510 to establish the “state” based on the “judgment”.

FIG. 7 shows the processing when the insertion TPC is determined, andFIG. 7 shows an example of the condition for determining the insertionTPC in W-CDMA.

On the basis of the input of FIG. 6, the TPC insertion status controlpart 81 makes a judgment concerning the condition in FIG. 6, and settleseach state. It judges the priority of each state or whether the state isachievable or unachievable, and selects any one of statuses of insertionof the inverted output to the previous output, insertion of an enforcedUP command, insertion of the comparison result between Target SIR andthe measured SIR measurement result and non-insertion, and outputs it asa TPC insertion status as shown in FIG. 7.

The operation is carried out on the basis of the TPC insertion status inthe insertion TPC determining part 510.

For example, when the comparison result between the Target SIR and theSIR measurement result indicates the insertion status, the calculationand determining processing of the insertion TPC in the call concerned iscarried out at the timing of the call concerned by using the measuredSIR and the Target SIR to determine and renew the insertion TPC.

As described with respect to the above example, as in the case of thepower setting processing, with respect to the processing of theinsertion TPC, the processing (control) concerning the determination ofthe insertion TPC is separated into the processing in the insertion TPCdetermining part 510, etc. to which real-time performance is trulyrequired as a portion at which the processing is not executed unless themeasurement result of SIR has been known, and the processing in the TPCinsertion status control part 81 as a portion to which real-timeperformance is not required because it has been known in advance.

The transmission power control processing for plural calls when theprocessing is separated into the processing (control) to which thereal-time performance is truly required, and the processing (control) towhich the real-time performance is not truly required because it hasbeen known in advance, will be described.

By utilizing the fact that the power setting status control processingand the TPC insertion status control processing to which the real-timeperformance is not truly required have been known in advance, forexample, the processing can be collectively executed on the plural callsin accordance with the load status of a processor in advance, and theload can be dispersed by uniquely determining the number of calls to beprocessed per unit time. As a result, this contributes to reduce theconcentration degree of the processing to which the real-timeperformance is truly required, and the problem that the permissible-timeregulation-unreachable problem due to the load concentration is relaxed.

As described above in detail, by the construction of the base stationand the transmission power control procedure, the load of the powercontrol processing can be dispersed, and also the effective permissibletime for the generation of the insertion TPC can be increased.

The present invention is suitably used for a radio base station forrelaxing load concentration of power control and relaxing control delayby a simple method, and a method of controlling the radio base station.

1. A radio base station that inserts a power control command intotransmission data so that reception quality of signals from a mobileterminal is constant and adjusts transmission power on the basis of thepower control command in reception data from the mobile terminal,comprising: a quality measuring part for measuring the quality of areception signal; a power control command insertion status control partfor controlling a condition for determining a power control command tobe inserted into transmission data; a power control command determiningpart for determining the power control command to be inserted on thebasis of the measured quality of the reception signal and the conditionfor determining the power control command; a detecting/judging part forsynchronously detecting and judging the power control command from thereception data; a power setting status controller for controlling acondition for determining transmission power for a call; a powerdetermining part for determining a transmission power value for the callconcerned on the basis of the judged power control command and thecondition for determining the transmission power; a frame generatingpart for inserting a pilot symbol for synchronous detection and a dummypower control command into encoded transmission data to generate aframe; a modulating part for subjecting the frame-generated transmissiondata to primary modulation; a spreading part for performing spreadingmodulation by using a spreading code of each call; and a power settingpart for multiplying the transmission power value determined in thepower determining part by a signal which is subjected to spreadingmodulation every call.
 2. The radio base station according to claim 1,wherein in order to insert a power control command, the power settingpart inverts the sign of the transmission power value determined in thepower determining part in accordance with the power control command. 3.The radio base station according to claim 1, wherein the determinationof the power control command in the power control command determiningpart and the determination of the transmission power value in the powerdetermining part are carried out at the timing of each call, and thecontrol processing in the power control command insertion status controlpart and the control processing in the power setting status control partare collectively executed on all calls under the control of the basestation.
 4. The radio base station according to claim 2, wherein thedetermination of the power control command in the power control commanddetermining part and the determination of the transmission power valuein the power determining part are carried out at the timing of eachcall, and the control processing in the power control command insertionstatus control part and the control processing in the power settingstatus control part are collectively executed on all calls under thecontrol of the base station.
 5. The radio base station according toclaim 1, wherein the determination of the power control command in thepower control command determining part and the determination of thetransmission power value in the power determining part are carried outat the timing of each call, and the control processing in the powercontrol command insertion status control part and the control processingin the power setting status control part are executed on all calls underthe control of the base station while the number of calls to beprocessed per unit time is determined.
 6. The radio base stationaccording to claim 2, wherein the determination of the power controlcommand in the power control command determining part and thedetermination of the transmission power value in the power determiningpart are carried out at the timing of each call, and the controlprocessing in the power control command insertion status control partand the control processing in the power setting status control part areexecuted on all calls under the control of the base station while thenumber of calls to be processed per unit time is determined.
 7. A methodof controlling a radio base station that inserts a power control commandinto transmission data so that reception quality of signals from amobile terminal is constant, and adjusts transmission power on the basisof the power control command in reception data from the mobile terminal,comprising: inserting a fixed symbol serving as a power control commandas a dummy irrespective of the quality of a reception signal measured ina quality measuring part, generating timing information for identifyinga symbol in which the power control command as the dummy is inserted andoutputting the timing information to the power setting part by a framegenerating part; modulating framed transmission data by a modulatingpart; spreading the transmission data in a spreading part; and settingthe power control command corresponding to the quality of the receptionsignal measured in the quality measuring part on the basis of the timinginformation and subjecting the spread transmission data to power settingby the power setting part.
 8. The control method for the radio basestation according to claim 7, wherein the power determining partdetermines a transmission power value, and the power setting partinverts the sign of the transmission power value in accordance with thepower control command.
 9. The control method for the radio base stationaccording to claim 7, wherein the power control command determining partexecutes the processing of determining the power control commandcorresponding to the quality of the reception signal measured in thequality measuring part at the timing of each call, the power determiningpart executes the processing of determining the transmission power valueat the timing of each call, the power control command insertion statuscontrol part executes the control processing on all the calls under thecontrol of the base station collectively and the power setting statuscontrol part collectively executes the control processing on all thecalls under the control of the base station.
 10. The control method forthe radio base station according to claim 8, wherein the power controlcommand determining part executes the processing of determining thepower control command corresponding to the quality of the receptionsignal measured in the quality measuring part at the timing of eachcall, the power determining part executes the processing of determiningthe transmission power value at the timing of each call, the powercontrol command insertion status control part executes the controlprocessing on all the calls under the control of the base stationcollectively and the power setting status control part collectivelyexecutes the control processing on all the calls under the control ofthe base station.
 11. The control method for the radio base stationaccording to claim 7, wherein the power control command determining partexecutes the processing of determining the power control commandcorresponding to the quality of the reception signal measured in thequality measuring part at the timing of each call, the power determiningpart executes the processing of determining the transmission power valueat the timing of each call, the power control command insertion statuscontrol part executes the control processing on all the calls under thecontrol of the base station while the number of calls to be processedper unit time is determined, and the power setting status control partexecutes the control processing on all the calls under the control ofthe base station while the number of calls to be processed per unit timeis determined.
 12. The control method for the radio base stationaccording to claim 8, wherein the power control command determining partexecutes the processing of determining the power control commandcorresponding to the quality of the reception signal measured in thequality measuring part at the timing of each call, the power determiningpart executes the processing of determining the transmission power valueat the timing of each call, the power control command insertion statuscontrol part executes the control processing on all the calls under thecontrol of the base station while the number of calls to be processedper unit time is determined, and the power setting status control partexecutes the control processing on all the calls under the control ofthe base station while the number of calls to be processed per unit timeis determined.